Self-adjustable sleeve-valve.



J. E. EDSTEDT. SELF ADJUSTABLE SLEEVE VALVE.

APPLICATION FILED Nov. a, I9I5.

Patented Oct. 3, 1916.

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J Ol-IN E.V EDSTEDT, 0F MINNEAPOLIS, MINNESOTA, ASSIGNOR TO UNIVERSAL MANU- FACTURING COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION OF MINNESOTA.

SELF-ADJUSTABLE SLEEVE-VALVE.

i Specification of Letters Patent. v Patented Oct. 3, 1916,

Application filed November 8, 1915. Serial No. 60,253.

To all whom t may concern Be it known that I, JOHN E. EDs'riiDi, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Self- Adjustable Sleeve-Valves; and I do hereby declare the following to be a full, clear, and exact description ofthe invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention'has for its object to provide anr expansible valve of the piston type,

strom, of date November 23rd, 1915, but it will be understood that the said valve isv capable of general application wherever an expvansible valve or similar device is required.

In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings: Figure 1 is a vertical section showing the cylinder, piston and one of the valves of the engine, some parts being broken away; Fig. 2 is a side elevation. of the valve showing the same removed from the engine; Fig. 3 is a plan or upper end view of the valve; Fig. 4 is a vertical section taken through the valve on* the line ai* of Fig. 2; and Fig. 5 is a horizontal section taken on the line m5 m5 of Fig. 4.

Of the parts of the engine, the numeral 1 indicates the cylinder, the numeral 2 the piston, the numeral 3 the connecting rod, the numeral 4 the cylindrical valve seat connected to the upper end of the cylinder by a port 5, the numeral 6 the sleeve-like piston valve, and the numeral 7, the rod for reciprocating the said valve, which latter is pivoted to the lower end of the said valve below ahorizontal partition thereof. In this arrangement, it is only'the upper end portion of the valve that is subjected to great heat, it being assumed that the said valve, in this instance 1s the exhaust valve of the engine. On its yside which is away from the port 5, the valve has a longitudinal slit 9 that extends from a point immediately above its horizontal partition 8, to the extreme upper end of the said valve. This slit makes the valve slightly, but suiiiciently expansible to takeup wear. Below its upper end, the said valve is provided with a conical internal flange 10 that is also split at one point by the slit 9. This conical flange 10 is engaged by the conical head of an expander 11, which expander is also formed with a depending sleeve-like portion 12-of decreased diameter, terminating at its lower end in a perforated head through which is passed a stud or rigid stem 13, the lower end of which is screwed into the horizontal partition 8 of the valve'.v The upper end of the stem 13 is threaded and is provided with a nut. 14. 'A coiled spring 15 surrounds the stem 13 andis compressed between the nut 14 and the lower end` of the sleeve 12, and hence, exerts a force which not only keeps theconical expanded head 11 in tight engagement' with the conical flange 10, but exerts suflicient force to automatically take up any play which may be caused by wear between the valve andV its seat. In this way,

the .valve vwill be automatically expanded andwill always be kept in close. engagement with its'` seat, `thereby avoiding leakage.

The port'5 will have considerable circumferential or lateral extension, but the slit in the valve is located on the far side thereof, and far beyond the extremities of the said port 5. All that portion of the valve therefore, which moves over the port 5, willbe kept i-n close engagement with its seat. The

held in position by an expansible split i plurality, as shown, 4L tapered surfaces at y l1a which, alone, engage the conical surface of the internal flange l() of the valve. have found that this limited contact gives better results than a complete circular contact, in that it is an easier matter-for the Y spring to move the expander and autoferentially expansible,

matically take up the play, due to wear, between the valve and valve seat.

l/Vhat I claim is:

l. rPhe combination with a circumferentially expansible piston-like valve or member, of a yieldingly pressed expander within said valve having tapered engagement therewith and exerting a yielding force tendingto expand the same.

2. The combination with a hollow pistonlike valve slit to make the same circumof `an expander within said valve having tapered engagement therewith, and a spring connection between said valve and expander exerting a force tending to expand said valve.

3. The combination with a hollow pistonlike valve slit to make the same circumferentially expansible, within said valve having tapered engagement therewith, a spring connection between said valve and expander exerting a force tending to expand said valve, Yand a detachable cap applied in the end. of said valve and protecting the said springconnection from external heat.

4l. v'lhecombination with a hollow piston vvalve having a longitudinal slit making the same expansihle, and having a transverse partition. in the vicinity of theV inner extremity of the slit, a stem' secured to said partition and extended axially within said valve, an expander having tapered engage mentwith the interior of said valve and provided with a sleeve surrounding said stem, a nut on said stem, and a coiled spring surrounding said stem and compressed between said nut and the end of the sleeve of said expander.

of an expander 5. The combination with a hollow piston valve having a longitudinal slit making the same expansible, and having a transverse partition in the vicinity of the inner extremity of the slit, a stem secured to said partition and extended axially within said valve, an expander having tapered engagement with the interior of said'valve and lprovided with a sleeve surrounding said stein, a nut on said stem, 'and a coiled spring surrounding said stem and compressed between said nut and therend` of the sleeve of said expander, and a cap detachably applied to the slit end of said sleeve and protecting said spring and expander from the direct action .of external heat.

6. ln an engine, the combination with a cylinder and *piston the former having a cylindrical valve seat on one side connected theretoby a port, of a hollow piston valve working in said valve seat, said valve having an internal partition Aand having a longitudinal slit extending approximately fromV said partition to the outer end of said valve, on that side ofthe valve which is opposite to said port,vandran expander in said valve having tapered engagement therewith. i

7. In an engine, the combination with a cylinder and vpiston the former having a cylindrical valve. seat on one side connected thereto by a port, of a hollow piston valve working in said valve seat, said valve having an internal partition and having a longitudinal slit extending approximately from said partition to the outerend of said valve, on that side of the valve which is opposite to said port,and a spring pressed expander within 'said valve having tapered engagement therewith, and a cap detachably applied to the outer 'end of said valve and protecting 'said spring pressed expander against the direct action of the external heat.

In testimony whereof I aiix my signature in presence of two witnesses.

JOHN E. EDSTEDT.

copies of this patent may be obtainedfor ve cents each, by addressing the Commissioner of Patents, Washington, D. 

